How Benzoyl Peroxide works?

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Benzoyl peroxide works by destroying P. acnes, the bacteria that causes the condition acne. It acts as an antiseptic and oxidizing agent, reducing the number of comedones, or blocked pores. It may be 2–3 weeks before you begin to see improvement.
One of the most commonly used ingredients, Benzoyl Peroxide can be very effective in treating mild cases of non-inflammatory acne. It’s safe for children as well as adults, and may combined with other topical or oral treatments.

While benzoyl peroxide kills existing P. acnes, it does not increase your body’s natural resistance to bacteria. So even when your breakouts begin to disappear, you should keep treating acne-prone areas. Why? This course of acne treatment kills bacteria, but it does not affect sebum production or the rate at which you shed your dead skin cells. If you stop using it, the bacteria — and your acne — will return.

Propionibacteria acnes, are the bacteria responsible for acne breakouts. They cannot live in an aerobic (oxygen-rich) environment. Benzoyl peroxide works by introducing oxygen into the pore, thereby killing P. acnes. When the bacteria population is reduced, the number of breakouts on the skin is reduced as well.

Another factor that makes benzoyl peroxide so effective is its ability to help rid the follicle of excess dead skin cells. Clearing the pore of cellular debris will lessen the chance of pore blockages, or comedones. Because of this, benzoyl peroxide helps prevent breakouts before they start.
The use of benzoyl peroxide often must be continued, even after acne clears up. Once treatments are stopped, bacterium populations can increase and acne may return. Your dermatologist can help you determine how long to continue your benzoyl peroxide treatments.